ok well i have problem. iv had my jack dempsey and my oscar in an 85 gallon tank for over a year and every thing has been fine. and now my oscar is picking on my JD. the only other tank mates are some clown loaches and some corrys and a 5'' pike that no one bothers or gets botherd by. and its just out of the blue. i have moved my JD into a 55. I know he will never be happy there becuse he just sits in a cave all day and just doesnt look himself (pale). so what im asking is. what could it be? do somthing with the cenary or should i just get a big tank for my JD?